'date' is not defined javascript react -convert js to react

Question

Not to sure why, but i am getting an error saying that the date is undefined. COuld someone help me out please?

let result = {};

let dates = [
"2020-10-20T10:28:20",
"2020-09-20T10:28:20",
"2020-08-20T10:28:20",
"2020-10-20T10:28:20",
"2020-09-20T10:28:20",
]


for (date of dates){
result[date.split('-')[1]] = 1 + (result[date.split('-')[1]] || 0);
}
console.log(result)

Updated code:

let dates = [
"2020-10-20T10:28:20",
"2020-09-20T10:28:20",
"2020-08-20T10:28:20",
"2020-10-20T10:28:20",
"2020-09-20T10:28:20",
]



dates.forEach(date=> {
  result[date.split('-')[1]] = 1 + (result[date.split('-')[1]] || 0);

})
console.log(result)

maybe for-of loop is an ES6 functionality and your env doesn't support that. Try using forEach instead like so: dates.forEach(date=>....rest of the logic here) — nishkaush
– nishkaush, Commented Oct 26, 2020 at 2:16
hey, thanks, could I also use a map? what would be the difference? could you also please show me how you would convert it? thanks! — stack
– stack, Commented Oct 26, 2020 at 2:17
map will give you back an array whereas forEach doesn't return anything. — nishkaush
– nishkaush, Commented Oct 26, 2020 at 2:19

nishkaush · Accepted Answer · 2020-10-26 02:29:51Z

1

Maybe try forEach like so:

dates.forEach(date=>{
  result[date.split('-')[1]] = 1 + (result[date.split('-')[1]] || 0);
});

let result = {};
let dates = [
"2020-10-20T10:28:20",
"2020-09-20T10:28:20",
"2020-08-20T10:28:20",
"2020-10-20T10:28:20",
"2020-09-20T10:28:20",
]



dates.forEach(date=> {
  result[date.split('-')[1]] = 1 + (result[date.split('-')[1]] || 0);

})
console.log(result)

edited Oct 26, 2020 at 2:29

answered Oct 26, 2020 at 2:20

nishkaush

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2 Comments

stack Over a year ago

hey, thanks. getting a date.split is not a function. Any ideas?

nishkaush Over a year ago

I have added a code snippet here and it seems to be working. could you share what kind of environment are you using for testing.

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